Registries - Atención a la ciudadanía - Guía PROP

Yes.

Article 16.4 of Law 39/2015, of October 1st, on the Common Administrative Procedure of Public Administrations states:
 

Documents addressed by interested parties to the bodies of Public Administrations may be submitted:

• Through the electronic registry of the Administration or Body to which they are addressed, as well as through the electronic registries of any of the entities referred to in Article 2.1:
  • The General State Administration.
  • The Administrations of the Autonomous Communities (or Regions).
  • The entities that make up the Local Administration.
  • The institutional public sector.
• At Post Offices, in the manner established by regulation.
• At Spanish diplomatic representations or consular offices abroad.
• At assistance offices for registry matters.
• At any other location established by current regulations.

• The submission of a document addressed to a local entity through a registry of the General State Administration or the Administration of the Generalitat is fully valid.
• Likewise, the submission of a document through a local entity’s registry addressed to the General State Administration or the Administration of the Generalitat is also valid.
  (The submission of documents to local entities is valid for all purposes without the need for any formal agreement).
• The date of entry in these registries will be valid for the purposes of meeting deadlines by citizens. However, the deadlines for resolution will be calculated from the date of entry in the electronic registry of the competent Administration or Body responsible for processing.